Cassini UVIS Auroral Observations of Jupiter

Conference (2002, July 29)

A two-stage stochastic programming framework for transportation planning in disaster response

Conference (2002, July 08)

This study proposes a two-stage stochastic programming model to plan the transportation of vital first-aid commodities to disaster-affected areas during emergency response. A multi-commodity multi-modal ... [more ▼]

This study proposes a two-stage stochastic programming model to plan the transportation of vital first-aid commodities to disaster-affected areas during emergency response. A multi-commodity multi-modal network flow formulation is developed to describe the flow of material over an urban transportation network. Since it is difficult to predict the timing and magnitude of any disaster and its impact on the urban system, resource mobilization is treated in a random manner, and the resource requirements are represented as random variables. Furthermore, uncertainty arising from the vulnerability of the transportation system leads to random arc capacities and supply amounts. Randomness is represented by a finite sample of scenarios for capacity, supply and demand triplet. The two stages are defined with respect to information asymmetry which discloses uncertainty during the progress of the response. The approach is validated by quantifying the expected value of perfect and stochastic information in problem instances generated out of actual data. [less ▲]

La problématique de la gestion des déchets ménagers en République d'Haïti

Conference (2002, July 01)

„... wieder eine recht peinliche Geschichte heute“ – zu Erzähltexten von Fontane, Heinrich und Thomas Mann

Conference (2002, July)

The role of benthic amphipods in Antarctic trophodynamics: a multidisciplinary study

Conference (2002, July)

Long-term controlled feeding experiments have been performed with four Antarctic amphipod species. For several weeks three scavenger and one herbivore species (Abyssorchomene plebs, Pseudorchomene coatsi ... [more ▼]

Long-term controlled feeding experiments have been performed with four Antarctic amphipod species. For several weeks three scavenger and one herbivore species (Abyssorchomene plebs, Pseudorchomene coatsi, Waldeckia obesa and Djerboa furcipes, respectively) have been fed ad libitum with an isotopically known food. The aim of those experiments was primarily to determine the isotopic fractionation factor between animals and diet. Secondly, turnover rates of tissues have been estimated by following their isotopic ratios evolution due to the shift of the food. Comparison has been made between herbivore and scavenger species. Such experimental data are necessary to improve isotope-based trophic models. [less ▲]

Polymerisation of olefins catalysed by transition-metal complexes. Contribution of the Laboratory of Macromolecular Chemistry and Organic Catalysis of the University of Liège

Conference (2002, July)

La naissance de l’aliénation. Sartre et le don

Conference (2002, June 22)

Husserl and Hilbert : theory of formal systems

Conference (2002, June 22)

Le souci constamment affiché par le fondateur de la phénoménologie de développer une théorie de la constitution des idéalités mathématiques dans les vécus de conscience, mais aussi l'importance accordée ... [more ▼]

Le souci constamment affiché par le fondateur de la phénoménologie de développer une théorie de la constitution des idéalités mathématiques dans les vécus de conscience, mais aussi l'importance accordée dans l'oeuvre husserlienne à l'intuition catégoriale, ont souvent incité les commentateurs à rapprocher la philosophie des mathématiques de Husserl de l'intuitionnisme brouwerien. Certains des plus proches disciples de Brouwer, tels Hermann Weyl ou Arend Heyting, se sont d'ailleurs explicitement revendiqués des analyses de Husserl pour compléter ou renforcer leurs propres positions intuitionnistes. Réciproquement, on sait quel intérêt le phénoménologue Oskar Becker a marqué pour les travaux de l'école intuitionniste. Identifier les philosophies intuitionniste et phénoménologique des mathématiques serait cependant occulter tout ce qui, dans les travaux de Husserl, le rapproche bien davantage de Hilbert que de Brouwer. Héritier sur ce point de Bolzano davantage que de Kant, Husserl est en effet en mathématiques un penseur de l’analytique plus que du synthétique, des rapports déductifs entre énoncés plus que des constructions des concepts. Comme chez l'auteur de la Wissenschaftslehre, ce sont les systèmes formels qui constituent la principale préoccupation de Husserl, et ce dès la Philosophie de l'arithmétique - dont la thèse fondamentale est précisément l'impossibilité de produire l'ensemble de l'arithmétique par construction - et jusqu'aux recherches génétiques des années 1920-1930 - qui continuent de distinguer explicitement la question de la genèse des concepts de celle de leur validation objective, qu’elle soit empirique ou, comme en mathématiques, purement formelle. On sait combien la proximité de Husserl et Hilbert à Göttingen aux alentours du changement de siècle fut stimulante pour la réflexion des deux mathématiciens sur la fondation de leur discipline, et notamment pour l'investigation de certaines notions métamathématiques comme celles de consistance, de catégoricité et de complétude. Si c'est au seul génie de Hilbert que revient d'avoir développé de manière rigoureuse le projet d'une fondation formaliste des mathématiques, Husserl, dont les préoccupations prirent quant à elles une tournure philosophique plus générale, ne manqua cependant pas de se référer à ce même projet à chaque fois qu'il revint sur la question plus spécifique des objets mathématiques. [less ▲]

Identification et antibiogramme automatisés. Bénéfices attendus et choix d'un système

Conference (2002, June 20)

The HST Campaign on Jupiter's Aurora during the Cassini Flyby

Conference (2002, June 17)

Characterization of the electron precipitation in the Jovian aurora from HST-STIS spectroscopy

Conference (2002, June 17)

Les fonctions antéhypophysaires non-corticotropes dans la maladie de Cushing.

Conference (2002, June 10)

Valuing green structures: the use of hedonic models to assess the influence of green structures on residential property values

Conference (2002, June 07)

L'hypertension artérielle et son risque

Conference (2002, June 02)

On the influence of aluminium and silicon contents on the kinetics of bainite transformation of intercritical austenite

Conference (2002, June)

TRIP-assisted steels show enhanced mechanical properties thanks to the strain-induced transformation of retained austenite to martensite (TRIP effect). Stabilization of austenite is made possible by the ... [more ▼]

TRIP-assisted steels show enhanced mechanical properties thanks to the strain-induced transformation of retained austenite to martensite (TRIP effect). Stabilization of austenite is made possible by the combination of appropriate chemical composition (containing classically high levels of silicon, or, as developed more recently, aluminium) and of a two-steps heat treatment comprising an intercritical annealing followed by an isothermal holding in the bainite formation range. A detailed understanding of the effects of both elements on the bainite transformation kinetics is thus of primary importance for the optimization of austenite retention. The present study aims at a better knowledge of the influence of aluminium levels on the kinetics of the bainite transformation of intercritical austenite, as compared to the effect of silicon. The bainite transformation kinetics was followed by dilatometry in a set of 6 steel grades with varying aluminium and silicon contents. These dilatometry experiments were coupled with a characterization of the microstructures by X-ray diffraction, SEM and image analysis in order to assess the occurrence of an incomplete reaction phenomenon. It was shown that aluminium has a less pronounced effect than silicon in retarding the bainite transformation. A model was proposed to account for this retarding effect as a function of aluminium or silicon contents. [less ▲]

Holographic interferometers based on photorefractive crystals for vibration measurements

Conference (2002, June)

Photorefractive crystals offer many advantages over other classical holographic recording media. They allow fast in-situ processable holographic recording as well as indefinite reusability. Moreover high ... [more ▼]

Photorefractive crystals offer many advantages over other classical holographic recording media. They allow fast in-situ processable holographic recording as well as indefinite reusability. Moreover high signal-to-noise ratio can be reached as well as high resolutions. We present several types of holographic instruments using such materials. Here we will emphasize their applications in vibration measurements. A first one is based on the classical stroboscopic technique, a second one uses a pulsed laser. [less ▲]

EXPERIMENTAL INVESTIGATION OF NOx FORMATION MECHANISMS IN A FUEL-OIL BOILER

Conference (2002, June)

The work whose results are reported in this paper was aimed at gathering information that can give a deeper insight into the structure of a diffusion fuel-oil flame. This allows us to get a better ... [more ▼]

The work whose results are reported in this paper was aimed at gathering information that can give a deeper insight into the structure of a diffusion fuel-oil flame. This allows us to get a better understanding of the combustion process and thus a correct basis for combustion modeling, focused on NOx formation. In order to attain the objective, axial and radial temperature, NOx and O2 concentration profiles have been measured in the flame for high and low firing rates of a domestic hot water boiler (around 424 and 270 kW respectively). Temperature was measured by means of two B-type thermocouples (diameters 0.5 and 0.35 mm) and NOx and O2 concentrations using a classical gas analyzer. Maximum NOx emissions (167 ppm at 424 kW and 134 ppm at 270 kW) were recorded in high oxygen concentration and low temperature zones of the flame ( ≈ 1000°C), where no thermal-NO can be formed. Flue gas recirculation and NOx destruction process is clearly demonstrated in the flame due to the higher NOx concentrations recorded in the combustion chamber near the burner exit than in the chimney. Near the burner exit NOx, O2 and temperature radial profiles are very unstable. Higher temperature fluctuations were detected with the small thermocouple in the measurements at 270 kW. The contribution of the three types of NOx formation mechanisms was obtained using a simplified model. According to these results, the majority of NOx in this type of flame could be caused by the prompt-NO mechanism, formed in the zone close to the burner exit at the location where secondary combustion air is introduced. [less ▲]

La recherche en matière de faillite d’entreprise : un état de sa situation et de ses perspectives d'avenir

Conference (2002, June)

This paper proposes a state-of-the-art of the research on business failure and discusses some promising avenues for research and evolution perspectives.

Influence of aluminium on the phase transformations during the heat treatments for the processing of multiphase TRIP-assisted steels

Conference (2002, June)

A la recherche d’alcaloïdes indolomonoterpéniques et autres substances naturelles à propriétés antiplasmodiales ou antitumorales

Conference (2002, May 31)

Ferney : une période pour les contes

Conference (2002, May 25)

Animation d'un atelier clinique : Analyse des troubles du langage présentés par une patiente après une encéphalite herpétique

Conference (2002, May 23)

An integrated approach for modelling gradual dam failures and downstream wave propagation

Conference (2002, May 17)

L'avenir du secteur agricole. Avantages d'une organisation de défense professionnelle

Conference (2002, May 16)

On the Uses and Abuses of Degenerate Art

Conference (2002, May 11)

Imaging and in Situ Particle Observations of Particles Accelerated by Auroral Electric Fields

Conference (2002, May 01)

Images from the IMAGE Wide-band Imaging Camera (WIC) and Spectrographic Imager (SI) channels SI12 and SI13, were compared to in situ data taken by FAST for several cases of substorm onsets and following ... [more ▼]

Images from the IMAGE Wide-band Imaging Camera (WIC) and Spectrographic Imager (SI) channels SI12 and SI13, were compared to in situ data taken by FAST for several cases of substorm onsets and following auroral conditions. FAST spacecraft observations had shown that the high latitude auroral ionosphere has several distinct regions and two of those are associated with intense particle precipitation The upward current region contains converging electric field structures, large-scale density cavities, down-going inverted V electrons and quasi-static potential structures. Another, sometimes distinct, region is characterized by filamentary currents containing Alfvenic electric fields, field aligned counter streaming (superthermal) electrons and ion heating transverse to B with associated large ion outflow. In two of the cases presented the satellite passed through the substorm surge on its duskward flank fairly soon after substorm onset. In these cases the superthermal wave accelerated component was clearly found to be on the polar cap boundary of the surge and could be isolated from inverted V precipitation which occurred in the more equatorward parts of the auroral oval. It is suggested that the wave accelerated precipitation is the signature of intense earthward-directed, Alfvenic Poynting fluxes usually observed at altitudes of 4-6 Re near the lobe/plasma sheet interface. In one of the cases the surge was accompanied by intense ion outflow. In three of the cases presented FAST passed through the substorm aurora at midnight or the dawn side outside of the surge and the wave accelerated electrons were less clearly separated from the inverted V type precipitation and the wave accelerated, electrons were seen to be part of very short lived transient events i.e. bursts. The ions were present equatorward of the surge with no enhancement poleward of their normal auroral oval position. The region of auroral forms, associated with intense Alfven waves propagating from the magnetosphere, are most likely to be produced by rapidly moving field lines through (substorm) dynamic reconfiguration unlike inverted V type electric field structures which may be produced by steady plasma convection. The ability to image the two different types of auroras would allow to map the field lines connected to regions of dynamic field configuration. [less ▲]

IMAGE-FUV multispectral observation of theta auroras.

Conference (2002, May 01)

The theta aurora is an auroral structure presenting a sun-aligned transpolar arc. Five different dynamic evolution of the transpolar arcs are known, some of them being symmetrical to each other, leaving ... [more ▼]

The theta aurora is an auroral structure presenting a sun-aligned transpolar arc. Five different dynamic evolution of the transpolar arcs are known, some of them being symmetrical to each other, leaving three basically different types of transpolar auroral features. The theta aurora was previously studied with in-situ particles detectors onboard polar orbiting satellites and by ultraviolet imagers. Previous imaging works focused on the electron aurora. We use the FUV imagers onboard the IMAGE spacecraft to study separately the proton and electron contributions to the transpolar arcs at the global scale. The imagers of the IMAGE-FUV experiment remotely sense the electron aurora with the WIC and SI13 imagers observing respectively the N[SUB]2[/SUB]-LBH and OI-135.6 nm emission, while the SI12 spectrographic imager measures the Doppler-shifted Lyman-ë± emission which is solely due to the auroral proton precipitation. The three different types of transpolar aurora will be analyzed using the IMAGE-FUV imagers. In particular, the relative contribution of proton and electron to the excitation of the theta aurora will be presented. [less ▲]

« Réutilisation des effluents de l’usine Hesbaye Frost pour la gestion des terres agricoles ».

Conference (2002, May)

L’adoption du projet de constitution d’une société civile par les élites urbaines africaines

Conference (2002, May)

Evaluation of deep water circulation with natural C-14 and helium-3 during OCMIP-2

Conference (2002, May)

Texture characterisation of ultramacroporous materials using non-destructive methods

Conference (2002, May)

Validation of off-line versus on-line simulations : water age tracer as a tool to assess internal variability effects in OGCM

Conference (2002, May)

Etude du point de fusion et de l'indice de cristallinité de l'inuline par DSC et TMDSC.

Conference (2002, May)

Primary cerebral lymphoma. A retrospective study of 32 patients

Conference (2002, April 25)

Forbidding Bodies: Avatars of the Phisical in the Work of Janet Frame

Conference (2002, April 23)

La surcharge pondérale chez l'enfant: un problème qui concerne toute la famille

Conference (2002, April 22)

Quand il n’y a ni transmission, ni héritage…

Conference (2002, April 19)

Syndrome centro-médullaire : aspects cliniques et radiologiques.

Conference (2002, April 18)

Core-Shell-Corona micelles with a responsive shell

Conference (2002, April 12)

Seasonal storage of relaimed wastemater in Tunisia : A means of uipgrading microbiogical quality". EPMR-2002.

Conference (2002, April)

Hypoxic pulmonary vasoconstriction and anaesthesia

Conference (2002, April)

Use of cell-seeded polylactide scaffolds in a new model of mouse spinal cord lesion to promote axonal regeneration.

Conference (2002, April)

Application of Different MS Types in Environmental Analysis : Dioxins and PCBs

Conference (2002, April)

Les logiques participatives dans le cadre du parcours d'insertion

Conference (2002, April)

Le document décrit une intervention sociologique de près de deux années visant à mettre sur pied un dispositif participatif dans le cadre du "parcours d'insertion" des chômeurs en formation. Il s ... [more ▼]

Le document décrit une intervention sociologique de près de deux années visant à mettre sur pied un dispositif participatif dans le cadre du "parcours d'insertion" des chômeurs en formation. Il s'interroge sur les fondements normatifs d'un tel dispositif, mais aussi sur les conditions pratiques de sa réalisation. Il décrit les résultats obtenus et débouche sur la question fondamentale à poser dans le cadre de la participation des citoyens les plus fragiles : ouverture démocratique ou manipulation ? La réponse proposée se trouve évidemment entre ces deux pôles. [less ▲]

The X-ray structure of the class D beta-lactamase OXA-2 from Salmonella typhymurium

Conference (2002, March 30)

La psychanalyse existentielle comme hontologie phénoménologique

Conference (2002, March 29)

Use of polylactide scaffolds in different models of spinal cord injury to promote axonal regeneration.

Conference (2002, March 23)

Infections et grossesse

Conference (2002, March 16)

Evaluation de l'exactitude du capteur de glucose CGMS chez des patients hospitalisés

Conference (2002, March 09)

Relaxant effect of K+ATP channel openers on the uterine smooth muscle: pharmacological in vitro models

Conference (2002, March 02)